1/* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#include "include/core/SkCanvas.h" 9#include "include/core/SkDocument.h" 10#include "include/core/SkStream.h" 11 12SkDocument::SkDocument(SkWStream* stream) : fStream(stream), fState(kBetweenPages_State) {} 13 14SkDocument::~SkDocument() { 15 this->close(); 16} 17 18static SkCanvas* trim(SkCanvas* canvas, SkScalar width, SkScalar height, 19 const SkRect* content) { 20 if (content && canvas) { 21 SkRect inner = *content; 22 if (!inner.intersect({0, 0, width, height})) { 23 return nullptr; 24 } 25 canvas->clipRect(inner); 26 canvas->translate(inner.x(), inner.y()); 27 } 28 return canvas; 29} 30 31SkCanvas* SkDocument::beginPage(SkScalar width, SkScalar height, 32 const SkRect* content) { 33 if (width <= 0 || height <= 0 || kClosed_State == fState) { 34 return nullptr; 35 } 36 if (kInPage_State == fState) { 37 this->endPage(); 38 } 39 SkASSERT(kBetweenPages_State == fState); 40 fState = kInPage_State; 41 return trim(this->onBeginPage(width, height), width, height, content); 42} 43 44void SkDocument::endPage() { 45 if (kInPage_State == fState) { 46 fState = kBetweenPages_State; 47 this->onEndPage(); 48 } 49} 50 51void SkDocument::close() { 52 for (;;) { 53 switch (fState) { 54 case kBetweenPages_State: { 55 fState = kClosed_State; 56 this->onClose(fStream); 57 // we don't own the stream, but we mark it nullptr since we can 58 // no longer write to it. 59 fStream = nullptr; 60 return; 61 } 62 case kInPage_State: 63 this->endPage(); 64 break; 65 case kClosed_State: 66 return; 67 } 68 } 69} 70 71void SkDocument::abort() { 72 this->onAbort(); 73 74 fState = kClosed_State; 75 // we don't own the stream, but we mark it nullptr since we can 76 // no longer write to it. 77 fStream = nullptr; 78} 79